SDD20型电传动内燃机车转向架的设计

简要介绍了SDD20型电传动内燃机车转向架的总体布置、主要技术参数和结构特点.     

极松软易破碎综放面巷道“降钻锚注平”支护技术

针对淮北矿区8^#煤层极松软易破碎综放面巷道支护技术难题，阐释了极松软易破碎综放面巷道支护失稳因素，基于支护-围岩协同作用机制，提出了以“巷道破底降帮+锚杆超前支护+锚索支护+超前注水注浆+平顶U型钢棚”支护为主的“降钻锚注平”支护技术。在此基础上，结合淮北矿区信湖煤矿815机巷地质条件，研究设计了极松软易破碎综放面巷道“降钻锚注平”支护技术，现场试验结果表明：信湖煤矿815机巷从掘进开始到巷道趋于稳定，顶底板相对移近量值最大值为117 mm,两帮相对移近量值最大值为66 mm,巷道支护效果良好，能够有效地控制极松软易破碎综放面巷道围岩的大变形，大幅提升了掘进速度。     

高校食品专业评价体系构建研究 ——《食品专业英语》评述

近年来,中国在国际贸易中的地位日益凸显,高校学生学习国外先进技术、开阔国际视野的需求逐渐增加.在这一新形势下,国家开设多样的专业用途英语课程,以期向国际输送复合型精英.教育部高等学校大学外语教学指导委员会《大学英语教学指南》指出,与通用英语课程所强调的"人文性"不同,专门用途英语旨在发挥大学英语课程的"工具性".学生通...     

基于多传感器数据融合的造纸企业水污染范围监测方法

为了满足造纸企业水环境的大范围、长期监测需求,利用多传感器数据融合技术,优化设计造纸企业水污染范围监测方法。在考虑污染物扩散规律的情况下,布设传感器网络,利用多类型传感器实时采集酸碱度、溶解氧量等污染数据,利用多传感器数据融合技术处理初始采集数据,根据水污染指标的计算结果判断当前位置的污染情况,得出造纸企业水污染范围的监测结果。通过与传统监测方法的对比,发现优化设计方法的范围监测误差降低了5.95m²。     

Simulation Studies of Rib Structure Effect on Discharge Characteristics of Plasma Display Panel

To investigate the effect of the rib structure on the discharge characteristics of the plasma display panel, the potential distribution, particles density distribution and ions incident angle distribution were examined by simulation of a two-dimensional particle-in-cell/Monte Carlo collision, with two kinds of rib structure： the stripe rib structure and the Waffle rib structure. The results showed that the distribution of electric potential at the corner of the discharge cell was almost the same for these two rib structures while in the centre there was a difference between these two rib structures. The striation phenomenon could be observed in both cases. The distribution of density also indicated that the striation phenomenon was accompanied by the firing of discharge, and the Waffle rib structure might reduce the density humps. In the cell with a stripe rib structure, the profiles of the surface charge density along the sustained dielectric layer presented a better fluctuating distribution than that in the cell with a Waffle rib structure. The spatial potential and particle density in the discharge bulk showed that the Waffle ribs could weaken the striation phenomenon, which could be explained by the decrease in the particle numbers in the discharge cell. The simulation results of the ion incident angle showed that most ions impacted the sustained dielectric layer in the normal stripe rib cell with an incident angle in the range of 6° to 19° while with the Waffle rib structure the incident angle of most ions was in the range of 4° to 19°. The Waffle rib structure did not affect the angle distribution of incident ions significantly.     

点式单波束多普勒测流系统的设计方法

为了加快多普勒流速计算速度和提高系统稳定性,提出基于FPGA技术的多普勒测速的设计方法,其中包括信号发射电路和信号接收电路;首先通过M码进行二相相移键控信号的调制,减少了回波误差、增加信号发射能量,有效地降低了水中超声波的能量耗散对信号提取的影响;然后对回波信号进行二相解调,并利用复自相关算法进行分析处理;最后,通过测速实验对所提方法进行验证;实验结果表明,所提方法不仅具有较低的实验误差而且具有较高的可靠性。     

The Gas Nucleation Process Study of Anatase TiO2 in Atmospheric Non-Thermal Plasma EnhancedChemical Vapor Deposition简

Abstract The gas phase nucleation process of anatase TiO2 in atmospheric non-thermal plasma enhanced chemical vapor deposition is studied. The particles synthesized in the plasma gas phase at different power density were collected outside of the reactor. The structure of the collected particles has been investigated by field scanning electron microscope （FESEM）, X-ray diffraction （XRD）, high resolution transmission electron microscopy （HRTEM） and selected area electron diffraction （SAED）. The analysis shows that uniform crystalline nuclei with average size of several nanometers have been formed in the scale of micro second through this reactive atmo- spheric plasma gas process. The crystallinity of the nanoparticles increases with power density. The high density of crystalline nanonuclei in the plasma gas phase and the low gas temperature are beneficial to the fast deposition of the 3D porous anatase TiO2 film.     

城镇砖混结构房屋的抗震优化设计

针对城镇的多层砖混房屋的常见震害进行了分析,并基于优化设计的理论,探讨了实现多层砖混房屋抗震优化设计的一些具体途径。     

一种新型改性交联壳聚糖的制备及其对废水中四环素的去除机理

为了提高传统壳聚糖材料的吸附效果,将壳聚糖进行交联并通过负载二氧化锰进行改性。利用扫描电镜对材料进行表征,并研究了二氧化锰的负载量、反应温度、溶液pH、离子浓度对改性交联壳聚糖吸附溶液中TC的影响。研究结果表明,在改性交联壳聚糖颗粒的二氧化锰负载量为0.344 mg/g,温度为318 K, pH为4～11,溶液中阳离子浓度为0时吸附效果最佳。吸附动力学符合伪二级动力学模型,吸附等温线符合Freundich模型,热力学分析说明该吸附过程是自发的吸热反应。另外发现,改性交联壳聚糖填充在管柱中之后对TC的连续吸附处理能力良好。     

共面介质阻挡放电对多孔织物的单面处理改性

采用共面介质阻挡放电(CDBD)和常压等离子体化学气相沉积(APECVD)的方法裂解六甲基二硅氧烷(HMDSO),对芳纶织物进行单面处理,在其表面沉积颗粒,达到表面改性效果.通过扫描电子显微镜(SEM)、傅里叶变换红外光谱(FTIR)、亲水性测试、热通量测试等方法研究芳纶织物处理前后的表面形貌、亲水能力和隔热性能变化....